CN203037578U - Composite film layer based optical fiber plasma wave sensor and sensing detecting system thereof - Google Patents
Composite film layer based optical fiber plasma wave sensor and sensing detecting system thereof Download PDFInfo
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- CN203037578U CN203037578U CN 201220696624 CN201220696624U CN203037578U CN 203037578 U CN203037578 U CN 203037578U CN 201220696624 CN201220696624 CN 201220696624 CN 201220696624 U CN201220696624 U CN 201220696624U CN 203037578 U CN203037578 U CN 203037578U
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- optical fiber
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
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- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
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Abstract
The utility model discloses a composite film layer based optical fiber plasma wave sensor which comprises an optical fiber joint 1, a coating layer 2, a cladding layer 3 and a fiber core 4. The cladding layer 3, the coating layer 2 and the optical fiber joint 1 sequentially wrap one end of the fiber core 4 from inside to outside, and the other end of the fiber core 4 is sequentially wrapped by an inner modulation layer and a golden film 5 from inside to outside. The utility model further discloses a sensing detecting system of the composite film layer based optical fiber plasma wave sensor. The composite film layer based optical fiber plasma wave sensor and the sensing detecting system thereof can well meet the requirement for monitoring effect of refractive index.
Description
Technical field
The utility model relates to a kind of optical fiber plasma wave sensor and sensing and detecting system thereof based on composite film, can measure liquid refractivity, can be applicable to biology, medical science and chemical field.
Background technology
Surface plasma body resonant vibration effect (Surface Plasmon Resonance) is to be present in metal and non-conductive medium physical optics phenomenon at the interface, can utilize its realization to the measurement of metal level and dielectric layer attribute subtle change.Optical sensing technology based on the SPR effect is applied in a plurality of fields such as biochemistry detection.Traditional optical fiber SPR sensor is based on fibre core-Jin film-surrounding medium three-decker, because its reflectance spectrum of SPR effect can form a trench.Along with the increase of test environment medium refraction index, waveform is to the skew of long wave direction, and there are certain corresponding relation in resonance wave trough position and refractive index, so can obtain the refractive index of surrounding medium by the position of measuring the resonance trough.This method has advantages such as loss is little, volume is little, integration is good, but has the not high shortcoming of sensitivity.
For improving transducer sensitivity, it is the optical fiber surface plasmon resonance body sensor of investigation mission outside the city or town preparative layer with MgF2 that people such as the Chen Yong of Chinese University of Science and Technology have studied.Adopt fibre core-silverskin-modulating layer-surrounding medium four-layer structure, wherein the fibre core numerical aperture is 0.37, and diameter is 0.2mm, and silver film thickness is 40nm, and modulating layer uses magnesium fluoride, and thickness is 10nm, and refractive index is 1.377.When the ranges of indices of refraction of analyte is 1.33-1.40, obtained the high sensitivity of 4464nm/RIU in the experiment.But what this sensor construction adopted is online reflective, online reflective detection method be light source at an end of optical fiber, detect through exciting reflected light after the SPR effect to receive at the other end, as shown in Figure 3.Because optical fiber should not be rolled over, thus be not easy to the sensitive zones of this structure is put into the container of splendid attire analyte, and be not suitable for actual measurement, this structure often is not used at present.（Yong Chen,Rongsheng Zheng,Yonghua Lu,Pei Wang,and Hai Ming.Fiber-optic surface plasmon resonant sensor with low-indexanti-oxidation coating[J],Chinese Optics Letters,2011,100605:1~4）。
The utility model content
Technical problem to be solved in the utility model provides a kind of have more excellent sensitivity and practicality, can better meet optical fiber plasma wave sensor and the sensing and detecting system thereof based on composite film of refractive index monitoring effect demand.
In order to solve the problems of the technologies described above, the utility model has designed a kind of optical fiber plasma wave sensor based on composite film, comprise fibre-optical splice 1, coat 2, covering 3 and fibre core 4, described covering 3, coat 2 and fibre-optical splice 1 wrap an end of fibre core 4 from inside to outside successively, and described fibre core 4 is enclosed with internal modulation layer 6 and golden film 5 from inside to outside successively with respect to the other end of fibre-optical splice 1.
As a kind of optimizing structure of the present utility model: the refractive index of described fibre core 4 is 1.45, and diameter is 0.6mm; The refractive index of described covering 3 is 1.39, and thickness is 0.2mm; The refractive index of described internal modulation layer 6 is 3.5, and thickness is 200nm; The thickness of described golden film 5 is 50nm.
The utility model has also designed a kind of sensing and detecting system of the optical fiber plasma wave sensor based on composite film, comprises wideband light source, fiber coupler, based on optical fiber plasma wave sensor, spectrometer and the computing machine of composite film, wherein;
Described wideband light source is connected with fiber coupler by multimode optical fiber, and wideband light source produces incident light, and transfers to fiber coupler;
The output terminal of described fiber coupler connects optical fiber plasma wave sensor and spectrometer based on composite film respectively by multimode optical fiber, and the incident light that receives is transferred to optical fiber plasma wave sensor based on composite film;
Described optical fiber plasma wave sensor based on composite film is placed in the testing liquid, and the incident light process that described fiber coupler sends is handled the back based on the SPR effect of the optical fiber plasma wave sensor of composite film and transferred to spectrometer with catoptrical form by fiber coupler;
Described spectrometer is connected with computing machine by data line, and described spectrometer transfers to computing machine with above-mentioned reflected light with the form of spectral signal;
Described computing machine is gathered the resonance spectrum signal from above-mentioned spectral signal, thereby obtains the relation of testing liquid refractive index and resonant wavelength.
The utility model compared with prior art has following advantage:
1. the utility model is by increasing the chromium film that covers refractive index 3.5, thickness 200nm, and the sensor that obtains has high sensitivity;
2. the designed build-in modulating layer type spr sensor of the utility model is the end reflection formula, and sensor stretches in the container of splendid attire test substance, is convenient to actual measurement, and is more practical.
Description of drawings
Fig. 1 is based on the optical fiber plasma wave sensor structural representation of composite film;
Fig. 2 is based on the sensor detecting system of the optical fiber plasma wave sensor of composite film and forms synoptic diagram;
Fig. 3 is online reflection type optical fiber spr sensor structural representation;
Fig. 4 is end reflection formula optical fiber SPR sensor structural representation;
Fig. 5 is based on the sensing model Z=0.8cm(transmission region in axial direction of the optical fiber plasma wave sensor of composite film) Poynting vector figure;
Fig. 6 is based on the sensing model Z=2.22cm(resonance zone in axial direction of the optical fiber plasma wave sensor of composite film) locate the Poynting vector figure in X-Y cross section;
Fig. 7 is that Poynting vector is located with the change curve of internal modulation layer thickness in golden film and internal modulation bed interface;
Fig. 8 is that Poynting vector is located with the variations in refractive index curve in golden film and internal modulation bed interface;
Fig. 9 is that the transducer tip power spectrum density is with internal modulation layer variations in refractive index curve;
Figure 10 is no internal modulation layer optical fiber probe measurement different liquids refractive index corresponding simulating resonance spectrum curve map;
Figure 11 is the optical SPR probe measurement different liquids refractive index corresponding simulating resonance spectrum curve map that contains 200nm thickness internal modulation layer.
The 1-fibre-optical splice, 2-coat, 3-covering, 4-fibre core, 5-gold film, 6-internal modulation layer.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail:
The utility model is based on the numerical simulation of nonlinear finite element method of difference (FDTD) and MATLAB.The nonlinear finite element method of difference is that the Maxwell equation is carried out differencing in time and space field, utilizes electric field and magnetic field in the space field to replace calculating, to reach the purpose of numerical evaluation.
Sensor construction adopts the end reflection formula as shown in Figure 4, and this structure is convenient to be stretched into sensor in the container of splendid attire test substance, thereby can sensitive perception test substance variations in refractive index situation.Fiber core refractive index is 1.45, and diameter is 0.6mm; Cladding index is 1.39, and thickness is 0.2mm; The gold film is selected Lorentz Drude model gold film for use, and thickness is 50nm, and the end plane metal film thickness is 200nm; Surrounding medium is air, and refractive index is 1, and incident light source is selected TM ripple (being vertically polarized wave) for use.For obtaining terminal power spectrum density, observation line is set endways.Optical fiber plasma wave sensor based on composite film is on above model based, increases one deck modulating layer between fibre core and golden film.
Fig. 5 and Fig. 6 are respectively based on the sensing model of the optical fiber plasma wave sensor of composite film Z=0.8cm(transmission region in axial direction) and the Z=2.22cm(resonance zone) locate the Poynting vector figure in X-Y cross section.At transmission region, it is the x=0 place that light-wave energy mainly concentrates on core centre.At resonance zone, energy peak appears at the both sides interphase of fibre core and modulating layer.This is because the SPR effect takes place resonance zone, makes light-wave energy leak into the interphase of golden film and fibre core.Sharply reducing at once behind the peak value appears in energy, illustrate strong energy attenuation has taken place herein, and this is caused by the SPR effect.
Make that internal modulation layer refractive index is 3.5, internally modulating layer thickness is that the model of 100nm, 150nm, 200nm, 250nm, 300nm, 350nm and 400nm carries out emulation respectively.Radially observation point is set the X=300um place at resonance zone along fibre core, obtains the Poynting vector of given viewpoint as shown in Figure 7.When the internal modulation layer thickness is 100nm, the energy of given viewpoint this energy value during much larger than other thickness.Along with the increase of internal modulation layer thickness, the energy of given viewpoint constantly descends, and this mainly is because the SPR phenomenon is more obvious, due to feasible more resonance energies shift.And when thickness during greater than 200nm, the given viewpoint energy is little along with the increase of thickness changes, and this explanation thickness continues to increase little to the influence of SPR effect.
Make that the internal modulation layer thickness is 200nm, internally modulating layer 6 refractive indexes are that 1.5,2.0,2.5,3.0,3.5,4.0 and 4.5 model carries out emulation respectively, at Fibre Optical Sensor end (Z=5.8cm) and the golden film of SPR effect takes place and the interphase place of internal modulation layer arranges observation point respectively.Figure 8 shows that the Poynting vector in golden film and X-Y cross section, internal modulation layer interphase place is with internal modulation layer variations in refractive index curve.When internal modulation layer refractive index is 3.5, the Poynting vector maximum, namely this moment energy to be leaked to golden film and modulating layer surface maximum, the SPR effect is the strongest.Fig. 9 is that the transducer tip power spectrum density is with internal modulation layer variations in refractive index curve; Internal modulation layer refractive index is 3.5 o'clock, and the power spectrum density of transducer tip correspondence is minimum, and this is because the SPR effect that excites in the optical fiber can cause the leakage gradually of light wave transmissions energy, and then makes the terminal energy of Fibre Optical Sensor present rapid decay.The SPR effect is more strong, and is just more low at the energy of the terminal given viewpoint of Fibre Optical Sensor, and corresponding average power spectral density value is also just more little.
Utilize the optical fiber SPR sensor of MATLAB to carry out emulation fiber lengths in season and be 20mm, core diameter 0.6mm, refractive index 1.45; Internal modulation layer thickness refractive index 3.5; Gold film thickness 50nm, specific inductive capacity is the function with wavelength variations, as shown in Equation (1):
n
AU=((1.8305e-6)×λ
2-0.0029818×λ+1.2385)
+i×((1.6277e-6)×λ
2+0.010483×λ-3.1186) （1）
No internal modulation layer and increase the optical fiber SPR sensor that covers the 200nm modulating layer with the simulation resonance spectrum curve map of surrounding medium variations in refractive index as shown in figure 10.Known to figure, increase the build-in modulating layer that covers 200nm thickness after, can find the increase along with the fluid to be measured refractive index, the formant waveform side-play amount obviously increases.
During no internal modulation layer, the resonant wavelength variation range is 650.47nm ~ 760.13nm.And when modulating layer was 200nm, the resonant wavelength variation range was 610.81nm ~ 820.36nm, and not only the resonance spectrum deviation range changes, and rate of curve obviously increases, and its slope is transducer sensitivity.Through calculating, three layers of optical fiber SPR sensor sensitivity of no internal modulation layer are 1096.6nm/RIU, and the sensitivity of 200nm internal modulation layer optical fiber SPR sensor is 2095.5nm/RIU.
Based on above-mentioned analysis, this paper select thickness be 200nm, refractive index be 3.5 material as the internal modulation layer, development is based on the optical fiber plasma wave sensor of composite film.
As shown in Figure 1, the utility model has designed a kind of optical fiber plasma wave sensor based on composite film, comprise fibre-optical splice 1, coat 2, covering 3 and fibre core 4, described covering 3, coat 2 and fibre-optical splice 1 wrap an end of fibre core 4 from inside to outside successively, and described fibre core 4 is enclosed with internal modulation layer 6 and golden film 5 from inside to outside successively with respect to the other end of fibre-optical splice 1.
As a kind of optimizing structure of the present utility model: the refractive index of described fibre core 4 is 1.45, and diameter is 0.6mm; The refractive index of described covering 3 is 1.39, and thickness is 0.2mm; The refractive index of described internal modulation layer 6 is 3.5, and thickness is 200nm; The thickness of described golden film 5 is 50nm.
At Fibre Optical Sensor probe processing link, at first use fiber cut cutter intercepted length as the optical fiber of 200mm, its both ends of the surface are polished, polish with optic fiber polishing machine.The optical fiber part that then will handle immerses in the concentrated sulphuric acid soaked 15 minutes, removed the coat 2 of optical fiber.Again the optical fiber lower end is inserted to be equipped with and left standstill in the polytetrafluoroethylcontainer container that concentration is the 40%HF acid solution about 1 hour, remove fibre cladding 3.With distilled water and the flushing of acetone soln alternate repetition, so just obtain having removed coat 2 and covering 3 at last, have only the optical fiber 4 of naked fibre core.
In the plated film link, optical fiber probe is inserted in the unit clamp, anchor clamps carry out uniform rotation around the furnace wall under the drive of motor, make outer fiber can plate 200nm chromium film (internal modulation layer 6) and 50nm gold film 5 uniformly.
Peel off coat 2 and covering 3 for one of optical fiber, at the outside of bare fibre plating internal modulation layer 6 and golden film 5, light in this resonance zone generation surface plasma wave resonance effects (SPR), is reflected back by the golden film 5 of fiber end face after the incident of other end then.
As shown in Figure 2, the utility model has also designed a kind of sensing and detecting system of the optical fiber plasma wave sensor based on composite film, comprise wideband light source, fiber coupler, based on optical fiber plasma wave sensor, spectrometer and the computing machine of composite film, wherein;
Described wideband light source is connected with fiber coupler by multimode optical fiber, and wideband light source produces incident light, and transfers to fiber coupler;
The output terminal of described fiber coupler connects optical fiber plasma wave sensor and spectrometer based on composite film respectively by multimode optical fiber, and the incident light that receives is transferred to optical fiber plasma wave sensor based on composite film;
Described optical fiber plasma wave sensor based on composite film is placed in the testing liquid, and the incident light process that described fiber coupler sends is handled the back based on the SPR effect of the optical fiber plasma wave sensor of composite film and transferred to spectrometer with catoptrical form by fiber coupler;
Described spectrometer is connected with computing machine by data line, and described spectrometer transfers to computing machine with above-mentioned reflected light with the form of spectral signal;
Described computing machine is gathered the resonance spectrum signal by software from above-mentioned spectral signal, thereby obtains the relation of testing liquid refractive index and resonant wavelength.
When concrete operations, at room temperature will put into ethanol, isopropyl alcohol, N successively based on the optical fiber plasma wave sensor of composite film, dinethylformamide, water, ethyl acetate, O-phthalic base dibutyl ester (DBP) are analyzed pure solution, and these liquid refractivities are followed successively by 1.335,1.341,1.344,1.371,1.381,1.392.Figure 11 is the resonance spectrum curve map of build-in modulating layer type optical fiber SPR sensor in 6 kinds of different refractivity solution.As seen from the figure along with the increase of solution refractive index, skew to the right takes place in the resonance spectrum based on the optical fiber plasma wave sensor of composite film, resonant wavelength is gradually varied to 746.15nm successively from 617.43nm, and the resonance spectrum side-play amount presents obvious increase when not having the internal modulation layer.
The result shows, by increasing build-in modulating layers 6 in fibre core 4 and golden film 5 inboards, make optical fiber SPR sensor sensitivity be greatly improved, the sensitivity coefficient of conventional three-decker optical fiber SPR sensor is 1140.3nm/RIU, and reaching 2263.1nm/RIU based on the sensitivity coefficient of the optical fiber plasma wave sensor of composite film, sensitivity has improved 98.5%.
Claims (3)
1. optical fiber plasma wave sensor based on composite film, comprise fibre-optical splice (1), coat (2), covering (3) and fibre core (4), described covering (3), coat (2) and fibre-optical splice (1) wrap an end of fibre core (4) from inside to outside successively, it is characterized in that: described fibre core (4) is enclosed with internal modulation layer (6) and golden film (5) from inside to outside successively with respect to the other end of fibre-optical splice (1).
2. the optical fiber plasma wave sensor based on composite film according to claim 1 is characterized in that, the refractive index of described fibre core (4) is 1.45, and diameter is 0.6mm; The refractive index of described covering (3) is 1.39, and thickness is 0.2mm; The refractive index of described internal modulation layer (6) is 3.5, and thickness is 200nm; The thickness of described golden film (5) is 50nm.
3. sensing and detecting system based on the described optical fiber plasma wave sensor based on composite film of claim 1, it is characterized in that, comprise wideband light source, fiber coupler, based on optical fiber plasma wave sensor, spectrometer and the computing machine of composite film, wherein;
Described wideband light source is connected with fiber coupler by multimode optical fiber, and wideband light source produces incident light, and transfers to fiber coupler;
The output terminal of described fiber coupler connects optical fiber plasma wave sensor and spectrometer based on composite film respectively by multimode optical fiber, and the incident light that receives is transferred to optical fiber plasma wave sensor based on composite film;
Described optical fiber plasma wave sensor based on composite film is placed in the testing liquid, and the incident light process that described fiber coupler sends is handled the back based on the SPR effect of the optical fiber plasma wave sensor of composite film and transferred to spectrometer with catoptrical form by fiber coupler;
Described spectrometer is connected with computing machine by data line, and described spectrometer transfers to computing machine with above-mentioned reflected light with the form of spectral signal;
Described computing machine is gathered the resonance spectrum signal from above-mentioned spectral signal, thereby obtains the relation of testing liquid refractive index and resonant wavelength.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105572078A (en) * | 2016-01-28 | 2016-05-11 | 南昌航空大学 | Two-core photonic crystal fiber SPR refractive index sensing model |
| CN107271334A (en) * | 2017-05-25 | 2017-10-20 | 东莞长盈精密技术有限公司 | Film layer liquid detecting system |
| CN108458994A (en) * | 2018-03-27 | 2018-08-28 | 南京信息工程大学 | Double D-type optical fiber sensors based on graphene composite film and preparation method thereof |
| JP7214282B1 (en) | 2022-01-28 | 2023-01-30 | 天津大学 | Near Waveguide Fiber Optic SPR Probe, Preparation Method and Sensing System |
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2012
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572078A (en) * | 2016-01-28 | 2016-05-11 | 南昌航空大学 | Two-core photonic crystal fiber SPR refractive index sensing model |
| CN105572078B (en) * | 2016-01-28 | 2018-04-10 | 南昌航空大学 | A kind of double-core photonic crystal fiber SRP refractive index sensing models |
| CN107271334A (en) * | 2017-05-25 | 2017-10-20 | 东莞长盈精密技术有限公司 | Film layer liquid detecting system |
| CN107271334B (en) * | 2017-05-25 | 2019-09-17 | 东莞长盈精密技术有限公司 | Film layer liquid detecting system |
| CN108458994A (en) * | 2018-03-27 | 2018-08-28 | 南京信息工程大学 | Double D-type optical fiber sensors based on graphene composite film and preparation method thereof |
| JP7214282B1 (en) | 2022-01-28 | 2023-01-30 | 天津大学 | Near Waveguide Fiber Optic SPR Probe, Preparation Method and Sensing System |
| JP2023110826A (en) * | 2022-01-28 | 2023-08-09 | 天津大学 | Near-guided-wave optical fiber spr probe, preparation method and sensing system |
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